blob: 4e48aa5c5c4e0ccd310c1909d5f8b9473e958bb2 [file] [log] [blame] [edit]
/*
* Copyright (c) 2022 Renesas Electronics Corporation and/or its affiliates
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <soc.h>
#include <zephyr/arch/arm/aarch32/nmi.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/watchdog.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(wdog_smartbond, CONFIG_WDT_LOG_LEVEL);
#define DT_DRV_COMPAT renesas_smartbond_watchdog
/* driver data */
struct wdog_smartbond_data {
/* Reload value calculated in setup */
uint32_t reload_val;
#ifdef CONFIG_WDT_SMARTBOND_NMI
const struct device *wdog_device;
wdt_callback_t callback;
#endif
};
static struct wdog_smartbond_data wdog_smartbond_dev_data = {};
static int wdg_smartbond_setup(const struct device *dev, uint8_t options)
{
ARG_UNUSED(dev);
if (options & WDT_OPT_PAUSE_IN_SLEEP) {
LOG_ERR("Watchdog pause in sleep is not supported");
return -ENOTSUP;
}
return 0;
}
static int wdg_smartbond_disable(const struct device *dev)
{
ARG_UNUSED(dev);
if (SYS_WDOG->WATCHDOG_CTRL_REG & SYS_WDOG_WATCHDOG_CTRL_REG_NMI_RST_Msk) {
/* watchdog cannot be stopped once started when NMI_RST is 1 */
return -EPERM;
}
GPREG->SET_FREEZE_REG = GPREG_SET_FREEZE_REG_FRZ_SYS_WDOG_Msk;
return 0;
}
#ifdef CONFIG_WDT_SMARTBOND_NMI
static void wdog_smartbond_nmi_isr(void)
{
if (wdog_smartbond_dev_data.callback) {
wdog_smartbond_dev_data.callback(wdog_smartbond_dev_data.wdog_device, 0);
}
}
#endif /* CONFIG_RUNTIME_NMI */
static int wdg_smartbond_install_timeout(const struct device *dev,
const struct wdt_timeout_cfg *config)
{
struct wdog_smartbond_data *data = (struct wdog_smartbond_data *)(dev)->data;
uint32_t reload_val;
#ifndef CONFIG_WDT_SMARTBOND_NMI
if (config->callback != NULL) {
return -ENOTSUP;
}
#endif
/* For RC32K timer ticks every ~10ms, for RCX ~21ms */
if (CRG_TOP->CLK_RCX_REG & CRG_TOP_CLK_RCX_REG_RCX_ENABLE_Msk) {
reload_val = config->window.max / 21;
} else {
reload_val = config->window.max / 10;
}
if (reload_val < 1 || reload_val >= 0x2000 || config->window.min != 0) {
/* Out of range supported by watchdog */
LOG_ERR("Watchdog timeout out of range");
return -EINVAL;
}
#if CONFIG_WDT_SMARTBOND_NMI
data->callback = config->callback;
data->wdog_device = dev;
z_arm_nmi_set_handler(wdog_smartbond_nmi_isr);
SYS_WDOG->WATCHDOG_CTRL_REG = 2;
#else
SYS_WDOG->WATCHDOG_CTRL_REG = 2 | SYS_WDOG_WATCHDOG_CTRL_REG_NMI_RST_Msk;
#endif
data->reload_val = reload_val;
while (SYS_WDOG->WATCHDOG_CTRL_REG & SYS_WDOG_WATCHDOG_CTRL_REG_WRITE_BUSY_Msk) {
/* wait */
}
SYS_WDOG->WATCHDOG_REG = reload_val;
return 0;
}
static int wdg_smartbond_feed(const struct device *dev, int channel_id)
{
struct wdog_smartbond_data *data = (struct wdog_smartbond_data *)(dev)->data;
ARG_UNUSED(channel_id);
while (SYS_WDOG->WATCHDOG_CTRL_REG & SYS_WDOG_WATCHDOG_CTRL_REG_WRITE_BUSY_Msk) {
/* wait */
}
SYS_WDOG->WATCHDOG_REG = data->reload_val;
return 0;
}
static const struct wdt_driver_api wdg_smartbond_api = {
.setup = wdg_smartbond_setup,
.disable = wdg_smartbond_disable,
.install_timeout = wdg_smartbond_install_timeout,
.feed = wdg_smartbond_feed,
};
static int wdg_smartbond_init(const struct device *dev)
{
ARG_UNUSED(dev);
#ifdef CONFIG_WDT_DISABLE_AT_BOOT
GPREG->SET_FREEZE_REG = GPREG_SET_FREEZE_REG_FRZ_SYS_WDOG_Msk;
#endif
return 0;
}
DEVICE_DT_INST_DEFINE(0, wdg_smartbond_init, NULL, &wdog_smartbond_dev_data, NULL, POST_KERNEL,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &wdg_smartbond_api);